论文标题
在强场电离中解开亚周期电子动量光谱
Disentangling the Sub-Cycle Electron Momentum Spectrum in Strong-Field Ionization
论文作者
论文摘要
强场电离（SFI）中隧道的量子计算预测了由于亚激光周期attosecond电子动力学而引起的复杂动量分布。这些在大多数实验中都通过周期间干扰模式的优势掩盖了这些实验，这是阈值高于阈值电离（ATI）的标志。高度控制的1至2周期激光脉冲会产生较少的周期间干扰，但由于脉冲的载体包络的效果，无法准确重现由均匀循环计算产生的亚周期特征。我们提出了一种简单有效的技术，可以恢复实验性多循环光谱中的这些亚周期特征。我们的时间过滤器的动量分布突出了源自电子轨迹对的干扰，而电离时间少于一个场循环。该方法可以消除ATI模式，并以前所未有的细节揭示了亚周期干扰结构。我们可以解决以前在早期实验中尚未指出的全息结构中的新调制，并提供了与计算相比的新参考。
Quantum calculations of tunneling in strong-field ionization (SFI) predict intricate momentum distributions due to sub-laser-cycle attosecond electron dynamics. These are obscured in most experiments by the dominance of inter-cycle interference patterns which are the hallmark of above-threshold ionization (ATI). Highly controlled 1- to 2-cycle laser pulses produce less inter-cycle interference but cannot accurately recreate the sub-cycle features produced by uniform cycle calculations due to the effect of the carrier envelope of the pulse. We present a simple and effective technique to recover these sub-cycle features in experimental multi-cycle spectra. We time-filter the momentum distribution to highlight features originating from the interference of electron trajectory pairs with ionization times less than one field cycle apart. This method removes the ATI patterns and reveals sub-cycle interference structures in unprecedented detail. We can resolve new modulations in holographic structures that have not been previously noted in earlier experiments and which provide a new reference for comparing to calculations.
